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First antenna: — The sensory bristle of the fifth joint (fig. 8) is somewhat thicker
proximally and grows narrow somewhat more abruptly distally than in the female; its nine
proximal sensory filaments are longer relatively and are thicker at the middle, rather
spool-shaped. Bristles of the seventh joint (figs. 9, 10): The b- and c-bristles are of about the same
relative lengths and have the same number of filaments, five and ten respectively, as in the female.
It is the three proximal filaments on these bristles that have suctorial organs. The proximal
one of these three filaments has no verruciform process distally of the sucker. The two others
are rather slightly stronger than the distal filaments and rather short relatively, of about the
same length as most of the latter ones; they have from five to seven small suctorial organs
distally, sometimes arranged rather irregularly; sometimes there is a small verruciform
process distally or proximally of these. The other filaments on these two bristles are on the
average somewhat longer than those of the female; the distal one on the c-bristle is exceedinglv
short. Bristles of the end joint: The f- and g-bristles are subequal and about twice as long as
the shell (on one specimen, for instance, with a shell 6,5 mm. long these bristles were 13 mm. long,
thus exactly double; in some cases they were somewhat shorter, in others even somewhat longer
relatively). In spite of this great length they have about the same number of filaments (from
19 to 22 were observed) as in the female; these filaments are also on the average somewhat
longer than in the female; the distal one is not short as is the case in the last-mentioned sex.
In other respects this antenna agrees with that of the female.
Second antenna: — This is considerably stronger than that of the female.
Protopodite: On some males with shells 6,5—6,6 mm. long this was 2,5—2,6 mm. in length.
Exopodite: In the males mentioned above this was 2,2—2,4 mm. long (in some females with
shells 6,6—6,7 mm. long this brauch measured only 1,9—2,0 mm.); the natatory bristles
somewhat, though only slightly, longer relatively than in the female. In other respects this limb
agrees very closely in both sexes.
The mandible, maxilla and fifth limb are very like those of the female.
Sixth limb: — This too shows very close agreement with that of the female,
but the bristles seem, however, to be on the average somewhat fewTer, especially on the second
exopodite joint, on which only 20—25 ventral bristles were observed. This divergency seems,
however, to be of less importance when one takes into considération the comparatively great
variability shown by this limb with regard to the number of its bristles.
The seventh limb is like that of the female; the end comb sometimes seems,
however, to be somewhat weaker than in this sex.
The furca, upper lip, rod-shaped organ and lateral eyes are
similar to those of the female.
The penis agrees with G. W. MÜLLER’s description.
Remarks: — In spite of the incompleteness and uncertainty of G. S. Brady’s original
description of Cypridina castanea there can scarcely be any doubt that the form described by
me above is to be referred to this species. — Although the original description is so deficient
there are, however, not a few differences that may be observed, but these are certainly to be
Differences from the
original description.
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